JP3604484B2 - Fluid screen changer - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a device for exchanging a screen used for extruding plastics, which is provided at the tip of a screw of a screw-type resin melting device (extruder) and removes foreign matter from a fluid.
[0002]
[Prior art]
Usually, the extruder is continuously operated. However, if the extruder is continuously operated for a long time, impurities and unmelted substances contained in the molten resin cause clogging of the screen, which hinders production. Therefore, it is necessary to replace the screen after a certain time. For this reason, as shown in FIG. 1, a device is used in which a sliding bar P2 on which a perforated plate P3 (generally called a breaker plate) on which a screen P4 is mounted is slid by hydraulic pressure or the like, and is replaced with a breaker plate on which a new screen is mounted. Had been.
[0003]
[Problems to be solved by the invention]
In such a conventional screen changing device, the screen has to be taken out of the device in order to replace the clogged screen. For this reason, the distance between the screens to be replaced becomes longer, and the resin passage is temporarily closed during the sliding process for replacement, and the resin pressure in the extruder cylinder rises abnormally, resulting in mechanical damage. For this reason, it was necessary to temporarily stop the molding apparatus.
[0004]
In order to avoid such a temporary stop of the device, an exchange device having two sets of sliding bars P2 may be used as shown in FIG. However, in this case, the apparatus becomes complicated and the price becomes expensive.
[0005]
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems of the prior art and to provide a screen exchange device in which a resin passage is not closed even during a screen exchange.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the configuration of the present invention is as follows. That is, in the first configuration, the sliding rod is slidable through the resin passage of the casing main body at a right angle, and the resin passage of the casing main body includes an inlet main passage and an outlet main passage. In a fluid screen changer in which a plurality of middle passages are provided at intervals in the length direction of the rod, the distance between adjacent middle passages of the sliding rod is such that the other middle passage is closed before one middle passage is closed. One or more bottomed filtration cylinders that are defined to be opened and inserted into the middle passage, and in the casing body, on both sides of the sliding rod with respect to the inlet main passage, in the sliding direction of the body, A discharge passage extending from the inner surface of the sliding rod hole to the outer surface of the main body, and the inner surface of the sliding rod hole of the main body from the outlet main passage on both sides in the sliding direction of the sliding rod with respect to the outlet main passage. An outlet auxiliary passage leading to the discharge passage or the outlet It is that the 2-way switching valve provided in the auxiliary passage is provided.
[0007]
The second configuration is such that a sliding rod is slidable through a resin passage in a distal end main body of the casing main body at a right angle, and the resin passage of the casing main body includes an inlet main passage and an outlet main passage. In a fluid screen changer in which a plurality of intermediate passages are provided on a rod at intervals in the longitudinal direction of the rod, the distance between adjacent intermediate passages of the sliding rod is such that one of the intermediate passages is closed before the other is closed. A passage is defined as being opened, and one or more bottomed filtration tubes inserted into the middle passage, and in the casing body, on both sides of the sliding rod with respect to the inlet main passage, in the sliding direction, A discharge passage extending from the inner surface of the slide rod hole of the main body to the outer surface of the main body, an outlet auxiliary passage communicating between the intermediate passages on the exit main passage side of the slide rod, and a discharge passage provided in the discharge passage. That is, a two-way switching valve is provided.
[0008]
In a third configuration, a sliding rod is slidable through a resin passage in the casing body at a right angle, and the resin passage in the casing body includes an inlet main passage and an outlet main passage. In the fluid screen changer in which the middle passages are provided at intervals in the longitudinal direction of the rod, the distance between the adjacent middle passages of the slide bar is such that the one middle passage is opened before the other middle passage is closed. And one or more bottomed filtration cylinders inserted into the middle passage, and the casing main body slides on both sides in the sliding direction of the slide bar with respect to the inlet main passage in the casing main body. A discharge passage extending from the inner surface of the moving rod hole to the outer surface of the main body, an inlet auxiliary passage communicated between the intermediate passages on the entrance main passage side of the slide rod, and a slide rod with respect to the exit main passage. On both sides of the sliding direction, from the outlet main passage, the body An outlet auxiliary channel leading to the inner surface of Suridoboana is that with the discharge passage or the outlet 2-way switching valve provided in the auxiliary passage is provided.
[0009]
In a fourth configuration, a sliding rod is slidable through the resin passage in the casing body at a right angle, and the resin passage in the distal end body includes an inlet main passage and an outlet main passage. In the fluid screen changer in which the middle passages are provided at intervals in the longitudinal direction of the rod, the distance between the adjacent middle passages of the slide bar is such that the one middle passage is opened before the other middle passage is closed. And one or more bottomed filtration cylinders inserted into the middle passage, and the casing main body slides on both sides in the sliding direction of the slide bar with respect to the inlet main passage in the casing main body. A discharge passage extending from the inner surface of the moving rod hole to the outer surface of the main body, an entrance auxiliary passage communicating with the intermediate passage on the entrance main passage side of the sliding rod, and an exit main passage side of the sliding rod on the exit main passage side; An outlet auxiliary passage communicating between the middle passages and a discharge passage are provided. And 2-way switching valve that is is that are provided.
[0010]
In a fifth configuration, a sliding rod is slidable through a resin passage in the casing body at a right angle, and the resin passage in the distal end body includes an inlet main passage and an outlet main passage. In the fluid screen changer in which the middle passages are provided at intervals in the length direction of the rod, the distance between the adjacent middle passages of the sliding bar is such that the one middle passage is closed before the other middle passage is closed. One or a plurality of bottomed filtration cylinders that are defined to be opened and inserted into the middle passage, and the casing main body, on both sides of the sliding rod with respect to the entrance main passage, in the sliding direction of the entrance main passage. An inlet auxiliary passage extending from the passage to the inner surface of the sliding rod hole of the main body; and a sliding rod hole of the main body from the outlet main passage on both sides in the sliding direction of the sliding rod with respect to the outlet main passage. An outlet auxiliary passage leading to the inner surface of the main body; A discharge passage leading to the surface, is that the three-way switching valve provided in the connecting portion between the discharge passage and the inlet auxiliary channel is provided.
[0011]
In a sixth configuration, a sliding rod is slidable through the resin passage in the casing main body at a right angle, and the resin passage in the distal end main body includes an inlet main passage and an outlet main passage. In the fluid screen changer in which the middle passages are provided at intervals in the longitudinal direction of the rod, the distance between the adjacent middle passages of the slide bar is such that the one middle passage is opened before the other middle passage is closed. And one or more bottomed filtration cylinders inserted into the middle passage, and the inlet main passage at both ends of the tip main body in the sliding direction of the sliding rod with respect to the inlet main passage. , An inlet auxiliary passage leading to the inner surface of the sliding rod hole of the main body, an outlet auxiliary passage communicating between the middle passages on the outlet main passage side of the sliding rod, and an outer surface of the main body from the inlet auxiliary passage. , The inlet auxiliary passage, and the discharge passage The provided connection point and 3-way switching valve is that is provided.
[0012]
According to a seventh configuration, in addition to any one of the first to sixth configurations , the middle passage of the slide bar penetrates a straight line passing through the diameter of the slide bar.
[0013]
According to an eighth aspect, in addition to any one of the first to sixth aspects, the middle passage of the slide bar penetrates a curve that changes its direction in a cross section in a diameter direction of the slide bar.
[0014]
According to a ninth configuration, in addition to any one of the first to sixth configurations , the bottomed filtration cylinder includes a reinforced porous cylinder and a screen stretched on the outer periphery, inner periphery, or middle thereof.
[0015]
According to a tenth configuration, in addition to any one of the first to eighth configurations, the bottomed filtration cylinder is formed of a cylinder having a large number of filtration holes.
[0016]
An eleventh configuration is in addition to any one of the first to tenth configurations , wherein the casing body communicates with a portion of the casing body where the inlet side of the backwash fluid faces when the bottomed filtration tube comes to the backwash position. And a forced discharge means provided as a part.
[0017]
In a twelfth configuration, a sliding rod is slidable through the resin passage of the casing main body at a right angle, and the resin passage of the casing main body includes an inlet main passage and an outlet main passage. In the fluid screen changer in which the middle passages are provided at intervals in the length direction of the rod, and the perforated plate and the screen are fitted in the middle passages, the distance between the adjacent middle passages of the sliding rod is one side. The other middle passage is defined to be opened before the middle passage is closed, and in the casing main body, on both sides of the slide main body with respect to the entrance main passage in the sliding direction of the slide rod, the slide rod holes of the main body are formed. A discharge passage extending from the inner surface to the outer surface of the main body, and an outlet auxiliary passage extending from the main outlet passage to the inner surface of the slide rod hole of the main body on both sides in the sliding direction of the sliding rod with respect to the main outlet passage. And the discharge passage or the outlet auxiliary passage A forcible discharge means provided in the casing body when the perforated plate and the screen come to the backwashing position, where the inlet side of the backwash fluid is communicated with the backwashing fluid. It is to include.
[0018]
[Action]
In the operating state, the resin passes through the inlet main passage, the middle passage, the screen, the perforated plate, and the outlet main passage. Due to the pressure difference between the inlet main passage and the outlet main passage, part of the resin passes through the inlet auxiliary passage, the three-way switching valve, the middle passage, and the outlet auxiliary passage, preventing the resin from remaining in the screen, perforated plate, and middle passage. are doing.
[0019]
If the screen is clogged with foreign matter, the sliding rod is moved to switch the screen. During this movement, the two middle passages simultaneously open into the main passage, so that the resin passes through both screens simultaneously. Therefore, the resin passage is not completely closed.
[0020]
Immediately after the screen is switched, the switching valve switches the flow path. The resin passes through the outlet auxiliary passage due to the pressure difference, passes through the screen in the reverse direction, removes foreign substances adhering to the screen surface, and is discharged outside through the discharge passage. When the preset washing time is over, the switching valve returns to the original flow path, a small amount of resin always flows through the screen from the inlet auxiliary passage to the outlet auxiliary passage, and the resin in the perforated plate and the passage stays. To prevent deterioration.
[0021]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described based on an embodiment shown in the drawings.
In FIG. 3, a cylindrical (or plate-shaped) sliding rod 2 penetrates a resin passage of a casing body 1 located at the tip of an extruder cylinder at a right angle, and is slidable by a hydraulic piston cylinder mechanism as a reciprocating means 5. It is said. The resin passage of the casing body 1 includes an inlet main passage 11 and an outlet main passage 13. A plurality of (two shown) middle passages 2a penetrate a straight line passing through the diameter of the rod and are provided at intervals in the longitudinal direction of the sliding rod 2, and the perforated plate 3 and the screen are provided in the middle passages 2a. 4 is fitted.
[0022]
Here, the distance between the adjacent middle passages 2a of the sliding rod 2 is determined so that one middle passage 2a is opened before the other middle passage 2a is closed.
[0023]
In the casing body 1, on both sides of the sliding rod 2 in the sliding direction with respect to the inlet main passage 11, an inlet auxiliary passage 12 extending from the inlet main passage 11 to the inner surface of the sliding rod hole of the main body 1 is provided. Can be Similarly, on the both sides of the main outlet 13 in the sliding direction of the slide bar 2, there are provided auxiliary outlet passages 14 extending from the main outlet 13 to the inner surface of the slide bar hole of the main body 1.
[0024]
Further, a discharge passage 15 is provided from the entrance auxiliary passage 12 to the outer surface of the main body 1, and a three-way switching valve (or cock) 6 is provided at a connection point between the two passages 12, 15.
[0025]
The operation state will be described above. In the operation state shown in FIG. 3, the resin passes through the inlet main passage 11, the left middle passage 2a, the screen 4, the perforated plate 3, and the outlet main passage 13. Here, due to the pressure difference between the inlet main passage 11 and the outlet main passage 13, a part of the resin (by-pass flow) passes through the inlet auxiliary passage 12, the three-way switching valve 6, the right middle passage 2a, and the outlet auxiliary passage 14. The resin passes through the screen 4, the perforated plate 3, and the middle passage 2a to prevent stagnation of the resin.
[0026]
At this time, if the screen 4 is clogged with foreign matter, the sliding bar 2 is moved to the left of the position shown in FIG. During this movement (FIG. 4), the two middle passages 2a are simultaneously opened in the main passage 11.13, so that the resin passes through both screens simultaneously. Therefore, the resin passage is not completely closed.
[0027]
Immediately after the screen 4 is switched to the position shown in FIG. 5, the switching valve 6 switches the flow path to the position shown in FIG. 6 by an external driving source (or manual) (not shown). The resin passes through the outlet auxiliary passage 14 due to the pressure difference, passes through the left screen 4 in the reverse direction, removes foreign substances adhering to the screen surface, and is discharged outside through the discharge passage 15.
[0028]
Then, after a preset washing time, the switching valve 6 returns to the state shown in FIG. 5, and a small amount of resin (bypass flow) always passes through the left screen 4 from the inlet auxiliary passage 12 to the outlet auxiliary passage 14. The resin in the perforated plate 3 and the passage is prevented from deteriorating due to stagnation.
[0029]
FIG. 7 shows another embodiment, in which there is no inlet auxiliary passage 14 and there is no bypass flow of the resin. That is, in the distal end main body 1, on both sides in the sliding direction of the sliding rod 2 with respect to the inlet main passage 11, a discharge passage 15 is provided from the inner surface of the sliding rod hole of the main body 1 to the outer surface of the main body. . On the both sides of the main outlet 13 in the sliding direction of the sliding rod 2, there are provided auxiliary outlet passages 14 extending from the main outlet 13 to the inner surface of the sliding rod hole of the main body 1. A two-way switching valve (or cock) 7 is provided in the discharge passage 15 or the outlet auxiliary passage 14. In the state shown in FIG. 7, a part of the resin flows backward, passes through the outlet auxiliary passage 14, the right screen 4, and is discharged to the outside from the discharge passage 15, and the screen 4 is backwashed. When the flow path of the two-way switching valve 7 is switched, the flow of the passages 14 and 15 stops.
[0030]
FIG. 8 shows still another embodiment. That is, the outlet auxiliary passage 14 may be provided in a groove shape along the inner surface of the slide rod hole without penetrating the inside of the distal end main body 1, or may be provided between the middle passages 2 a and 2 a of the slide rod 2. Are provided with holes or grooves (shown by dotted lines) communicating with each other.
[0031]
9 and 10 show still another embodiment, in which a groove or a hole is provided in which the inlet auxiliary passage 12 and the outlet auxiliary passage 14 communicate between the middle passages 2a, 2a of the sliding rod 2, and a two-way switching valve (or A cock 7 is provided in the discharge passage 15.
[0032]
In FIG. 9, the main flow Q of the resin flows through the inlet main passage 11, the left middle passage 2a, and the outlet main passage 13. The minute flow (bypass flow) ΔQ flows through the inlet auxiliary passage 12, the right middle passage 2a, and the outlet auxiliary passage 14 to prevent stagnation in the right middle passage 2a.
[0033]
In FIG. 10, when the screen 4 is clogged, the slide bar 2 is moved to the left, and the left valve 7 is opened. The main flow Q passes through the right middle passage 2a and exits from the exit main passage 13. At the same time, the minute flow ΔQ from the right middle passage 2a flows back through the outlet auxiliary passage 14 and the left middle passage 2a due to the pressure difference, and the clogged screen 4 is discharged from the valve 7 through the discharge passage 15 to be washed. I do. At this time, the minute flow ΔQ from the inlet auxiliary passage 12 is also discharged at the same time. However, since this is extremely small relative to the main flow Q, the performance is not affected.
[0034]
When the cleaning is completed, when the valve 7 is closed, the stagnation of the left middle passage 2a is prevented by the minute flow from the inlet auxiliary passage 12 as described above.
[0035]
When the right screen 4 is clogged, the slide bar 2 is moved to the right again to bring it to the state shown in FIG. 9, the valve 7 is opened and the washing is performed in the same manner as described above, and then the valve 7 is closed to close the right side. The minute flow ΔQ is secured in the passage 2a.
[0036]
In FIG. 11, the middle passage 2a of the sliding rod 2 is provided so as to penetrate on a curve turning around 90 degrees on the radius of the rod, and the entrance and exit main passages 11 and 13 are correspondingly provided. They are almost 90 degrees from each other. It is practical that the direction change angle (the angle between the opening direction of the inlet main passage 11 and the outlet main passage 13) is 90 to 160 degrees.
[0037]
When two sets of the sliding rods 2 are provided in parallel, the middle passage of one of the sets always communicates with the main passages 11 and 13. Therefore, the interval between the adjacent middle passages 2a of the sliding rod 2 does not need to be determined so that the one middle passage 2a is opened before the other middle passage 2a is closed, and is wider than that. Is also good.
[0038]
In FIG. 12, a filter cylinder 20 with a bottom is used in place of the perforated plate 3 and the screen 4, so that the filtration area is greatly increased. The bottomed filtration tube 20 has a bottom side located on the inlet side large diameter side of the middle passage 2a, and is configured as follows. The reinforced porous cylinder 21 has a straight cylinder (or a tapered cylinder), and a cylindrical screen 22 is mounted on the outer periphery (or inner periphery, middle) thereof. The bottom member 23 attached to one end of the reinforcing porous cylinder 21 with a screw has an outer center convex outward. The guide member 24 has a tapered tapered shape protruding on an axis inside the bottom member 23. The flange member 25 has an annular shape provided on the opening side of the porous tube 21, and a portion facing the inner surface of the casing body 1 has a cylindrical surface flush with the outer peripheral surface of the cylindrical sliding rod 2.
[0039]
The middle passage 2a of the sliding rod 2 is a tapered hole (or a straight cylindrical hole) in which the bottom member side of the bottomed filter cylinder 20 is wide, and the inlet and outlet are located on a straight line of the casing. The auxiliary passages 2 b and 25 a are provided on the slide bar 2 and the outlet side of the bottomed filtration tube 20.
[0040]
The fluid passes through the screen 22 and the perforated tube 21 from the outside of the bottomed filter tube 20, enters the inside, and exits through the outlet 13 while being guided by the guide member 24.
[0041]
FIG. 13 shows an example in which the screen 22 is attached to the inner periphery of the perforated tube 21. In this case, the mounting direction of the bottomed filtration tube 20 is reversed so that the fluid passes from the inside to the outside of the bottomed filtration tube 20. Alternatively, if the screen 22 is interposed between the second reinforcing porous cylinder (not shown), the fluid can pass from inside or outside.
[0042]
FIGS. 14, 15, and 16 show a case where the inlet 11 (located on the side surface) and the outlet 13 (located on the upper surface) of the casing body 1 are deflected by 90 degrees. The middle passage 2a is bent by 90 degrees in the cross section in the diameter direction of the sliding rod 2, and a second middle passage 2a 'is provided. 2b is an auxiliary passage.
[0043]
As the bottomed filtration tube 20, in addition to the above-mentioned embodiment, for example, a filtration tube made of a sintered metal having a large number of fine voids (through holes), a multilayered net formed into a bottomed cylindrical shape, or the like is applied. . In addition, a filtration hole may be provided at the bottom of the bottomed filtration tube 20. The cylinder includes a hemispherical shell.
[0044]
17, 18, and 19, in the casing main body 1, when the bottomed filtration tube 20, the perforated plate 3, and the screen 4 come to the back washing position, the inlet side of the back washing fluid communicates with the portion facing the back washing fluid to forcibly. Discharge means 40 is provided. In FIG. 17, a power piston pump 41 is provided as forcible discharge means 40, and a piston 41a is slidably fitted in a hole of the casing body 1, and is reciprocated by a hydraulic piston cylinder mechanism 41b as reciprocating drive means. . As a result, the fluid in the middle passage 2a and the filter tube 20 is forcibly discharged to the outside of the tube, and at the same time, the deposits on the screens 4 and 22 are removed and the screen is washed back. Also, as shown in FIG. 18, the water is discharged by a manual piston pump 42. The piston rod 42a of the piston 42a is pin-connected in the middle of the lever 42c, and the tip of the lever 42c is pin-connected to the bracket 42d.
[0045]
As shown in FIG. 19, a screw pump 43 is provided as the forcible discharging means 40, and the screw 43a is rotated by the electric rotating motor 43b.
[0046]
FIG. 20 shows a case where a plurality of bottomed filtration tubes are combined. The plurality of bottomed filtration tubes 51 are attached to the substrate 52 at intervals with their axes parallel to each other, and the openings of the respective bottomed filtration tubes communicate with the holes of the substrate 52.
[0047]
The present invention is used for fluids such as other liquids in addition to molten plastic.
[0048]
The present invention is not limited to the examples and embodiments described above, but includes various modifications without departing from the spirit and scope of the claims.
[0049]
【The invention's effect】
According to the first and second configurations of the present invention, it is possible to replace the screen without stopping the forming apparatus by using an inexpensive single slide apparatus. Further, since the apparatus is not stopped, the molding line can be continuously produced, and the production loss can be reduced. In addition, the screen is washed with resin by operating the two-way switching valve. The filtration area is greatly increased due to the bottomed filtration tube.
[0050]
By the third, fourth, fifth, and sixth configurations, in addition to the effects of the first and second configurations, by operating the valve, a small amount of resin always flows into an unused passage, and deterioration due to stagnation of the resin is prevented. .
[0051]
According to the seventh configuration, in addition to the effects of any one of the first to sixth configurations, machining of the middle passage is easy.
[0052]
According to the eighth configuration, in addition to the effects of any one of the first to sixth configurations, another component for changing the direction of the flow path can be omitted.
[Detailed description of drawings]
FIG. 1 is a longitudinal sectional view of a conventional single slide plate type screen exchange device.
FIG. 2 is a longitudinal sectional view of a conventional double slide block type screen exchange device.
FIG. 3 is a longitudinal sectional view of a single type slide block type screen exchange device of the present invention.
FIG. 4 is an explanatory diagram of an operation state of FIG. 3;
FIG. 5 is an explanatory diagram of an operation state of FIG. 3;
FIG. 6 is an explanatory diagram of an operation state of FIG. 3;
FIG. 7 is a longitudinal sectional view of another embodiment of the present invention.
FIG. 8 is a longitudinal sectional view of still another embodiment of the present invention.
FIG. 9 is a longitudinal sectional view of still another embodiment of the present invention.
FIG. 10 is an explanatory diagram of an operation state of FIG. 9;
FIG. 11 is a view showing another embodiment of the middle passage of the sliding rod.
FIG. 12 is a longitudinal sectional view of another embodiment of the present invention.
FIG. 13 is a longitudinal sectional view of another embodiment of the present invention.
FIG. 14 is a plan view of another embodiment of the present invention.
FIG. 15 is a vertical sectional view taken along a line 15-15 in FIG. 14;
FIG. 16 is a vertical sectional view taken along 16-16 in FIG. 14;
FIG. 17 is a sectional view of an embodiment of the forcible discharging means of the present invention.
FIG. 18 is a sectional view of another embodiment of the forcible discharging means of the present invention.
FIG. 19 is a sectional view of still another embodiment of the forcible discharging means of the present invention.
FIG. 20 is a sectional view of another embodiment of the bottomed filtration tube of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Casing main body 11 ... Inlet main passage 12 ... Inlet auxiliary passage 13 ... Outlet main passage 14 ... Outlet auxiliary passage 15 ... Discharge passage 2 ... Sliding rod 2a ... Middle passage 2a '... Second middle passage 2b ... Auxiliary passage 3 ... Perforated plate 4 ... Screen 5 ... Reciprocating means 6 ... 3-way switching valve 7 ... 2-way switching valve 20 ... Bottomed filter cylinder 21 ... Reinforced porous cylinder 22 ... Screen 23 ... Bottom member 24 ... Guide member 25 ... Flange member 25a ... Auxiliary Passage 40 ... forced discharge means 41 ... power piston pump 41a ... piston 41b ... hydraulic piston cylinder 42 ... manual piston pump 42a ... piston 42b ... piston rod 42c ... lever 42d ... bracket 43 ... screw pump 43a ... screw 43b ... electric rotary motor

Claims (12)

A sliding rod is slidable through the resin passage of the casing body at a right angle, and the resin passage of the casing body includes an inlet main passage and an outlet main passage. In a fluid screen changer provided at intervals in the length direction,
The distance between adjacent middle passages of the slide bar is determined such that one middle passage is opened before the other middle passage is closed,
One or more bottomed filtration cylinders inserted into the middle passage;
In the casing body, on both sides in the sliding direction of the slide bar with respect to the inlet main passage, a discharge passage extending from the inner surface of the slide bar hole of the body to the outer surface of the body,
With respect to the exit main passage, on both sides in the sliding direction of the slide bar, from the exit main passage, an exit auxiliary passage reaching the inner surface of the slide rod hole of the main body,
A fluid screen changer, comprising: a two-way switching valve provided in the discharge passage or the outlet auxiliary passage. A sliding rod is slidable through the resin passage in the distal end main body of the casing main body at a right angle, and the resin passage of the casing main body includes an inlet main passage and an outlet main passage. In a fluid screen changer in which passages are provided at intervals in the length direction of the rod,
The distance between adjacent middle passages of the slide bar is determined such that one middle passage is opened before the other middle passage is closed,
One or more bottomed filtration cylinders inserted into the middle passage;
In the casing body, on both sides in the sliding direction of the slide bar with respect to the inlet main passage, a discharge passage extending from the inner surface of the slide bar hole of the body to the outer surface of the body,
On the exit main passage side of the sliding rod, an exit auxiliary passage communicating between the middle passages,
A fluid screen changer, comprising: a two-way switching valve provided in the discharge passage. A sliding rod is slidable through the resin passage in the casing main body at a right angle, and the resin passage in the casing main body includes an inlet main passage and an outlet main passage, and the sliding rod has a plurality of medium passages. In a fluid screen changer provided at intervals in the length direction,
The distance between adjacent middle passages of the slide bar is determined such that one middle passage is opened before the other middle passage is closed,
One or more bottomed filtration cylinders inserted into the middle passage;
In the casing body, on both sides in the sliding direction of the slide bar with respect to the inlet main passage, a discharge passage extending from the inner surface of the slide bar hole of the body to the outer surface of the body,
On the entrance main passage side of the sliding rod, an entrance auxiliary passage communicating between the middle passages,
With respect to the exit main passage, on both sides in the sliding direction of the slide bar, from the exit main passage, an exit auxiliary passage reaching the inner surface of the slide rod hole of the main body,
A fluid screen changer, comprising: a two-way switching valve provided in the discharge passage or the outlet auxiliary passage. A sliding rod is slidable through the resin passage in the casing body at a right angle, and the resin passage of the distal end body includes an inlet main passage and an outlet main passage. In a fluid screen changer provided at intervals in the length direction,
The distance between adjacent middle passages of the slide bar is determined such that one middle passage is opened before the other middle passage is closed,
One or more bottomed filtration cylinders inserted into the middle passage;
In the casing body, on both sides in the sliding direction of the slide bar with respect to the inlet main passage, a discharge passage extending from the inner surface of the slide bar hole of the body to the outer surface of the body,
On the entrance main passage side of the sliding rod, an entrance auxiliary passage communicating between the middle passages,
On the exit main passage side of the sliding rod, an exit auxiliary passage communicating between the middle passages,
A fluid screen changer, comprising: a two-way switching valve provided in the discharge passage. A sliding rod is slidable through the resin passage in the casing body at a right angle, and the resin passage of the distal end body includes an inlet main passage and an outlet main passage. In a fluid screen changer provided at intervals in the length direction,
The distance between adjacent middle passages of the slide bar is determined such that one middle passage is opened before the other middle passage is closed,
One or more bottomed filtration cylinders inserted into the middle passage;
In the casing main body, on both sides in the sliding direction of the sliding rod with respect to the main inlet path, an auxiliary inlet path from the main inlet path to an inner surface of the main body sliding rod hole,
With respect to the exit main passage, on both sides in the sliding direction of the slide bar, from the exit main passage, an exit auxiliary passage reaching the inner surface of the slide rod hole of the main body,
A discharge passage from the inlet auxiliary passage to the outer surface of the main body,
A fluid screen changer, comprising: a three-way switching valve provided at a connection point between the inlet auxiliary passage and the discharge passage. A sliding rod is slidable through the resin passage in the casing body at a right angle, and the resin passage in the distal end body includes an inlet main passage and an outlet main passage. In a fluid screen changer provided at intervals in the length direction,
The distance between adjacent middle passages of the slide bar is determined such that one middle passage is opened before the other middle passage is closed,
One or more bottomed filtration cylinders inserted into the middle passage;
In the distal end main body, on both sides in the sliding direction of the sliding rod with respect to the inlet main passage, an entrance auxiliary passage from the entrance main passage to the inner surface of the sliding rod hole of the main body,
On the exit main passage side of the sliding rod, an exit auxiliary passage communicating between the middle passages,
A discharge passage from the inlet auxiliary passage to the outer surface of the main body,
A fluid screen changer, comprising: a three-way switching valve provided at a connection point between the inlet auxiliary passage and the discharge passage. 7. The fluid screen changer according to claim 1 , wherein the middle passage of the slide bar penetrates a straight line passing through a diameter of the slide bar. The fluid screen changer according to any one of claims 1 to 6, wherein the middle passage of the slide bar penetrates on a curve that changes its direction in a cross section in a diameter direction of the slide bar. The fluid screen changer according to any one of claims 1 to 6, wherein the bottomed filtration cylinder includes a reinforced porous cylinder and a screen stretched on the outer periphery, inner periphery, or middle thereof. The fluid screen changer according to any one of claims 1 to 8, wherein the bottomed filtration cylinder comprises a cylinder having a large number of filtration holes. 11. The casing body according to claim 1 , further comprising: forcible discharge means provided in communication with a portion where the inlet side of the backwash fluid is opposed when the bottomed filtration tube comes to the backwash position. fluid screen changer of one of claims. A sliding rod is slidable through the resin passage of the casing body at a right angle, and the resin passage of the casing body includes an inlet main passage and an outlet main passage. In the fluid screen changer in which a perforated plate and a screen are fitted in the middle passage, provided at intervals in the length direction, the gap between the adjacent middle passages of the sliding rod is one of which is closed. Before the other, the middle passage is opened,
In the casing body, on both sides in the sliding direction of the slide bar with respect to the inlet main passage, a discharge passage extending from the inner surface of the slide bar hole of the body to the outer surface of the body,
With respect to the exit main passage, on both sides in the sliding direction of the slide bar, from the exit main passage, an exit auxiliary passage reaching the inner surface of the slide rod hole of the main body,
A two-way switching valve provided in the discharge passage or the outlet auxiliary passage,
A fluid screen comprising: a forcible discharge means provided in the casing main body when the perforated plate and the screen come to a backwash position, the forcible discharge means being provided in communication with a portion where the inlet side of the backwash fluid faces. Changer.

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